prometheus自定义注册表

// 在自定义注册表中只有需要的变量，没有默认的Go运行时指标和prometheus指标
registry := prometheus.NewRegistry()
test:= prometheus.NewCounter(prometheus.CounterOpts{
    Name: "test",
    Help: "test",
})
registry.MustRegister(test)
http.Handle("/metrics", promhttp.HandlerFor(registry, promhttp.HandlerOpts{}))